JP6831294B2 - Bath water heater - Google Patents

Description

The present invention relates to a bath water heater, and more specifically, the water (hot water) filled in the bathtub can be reheated every time a predetermined time elapses to keep the bath temperature warm. It relates to a bath water heater with a built-in bath heating device.

Conventionally, in a bath hot water supply device that detects a person's bathing by changing the pressure of this type of water level sensor, even if a person bathes in the bathtub while the pump is driving, the water level sensor detects the pressure due to the driving of the pump. However, there was a problem that it was not possible to make an accurate bathing judgment, but a person entered the bathroom with an entry detection unit that detects that the bather entered the bathroom and a circulation path that can circulate the hot water in the bathtub. It has been known that when the entry detection unit detects that the bathing has occurred, the pump for circulating in the circulation path is stopped and the water level is detected based on the stop signal (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2015-137818

However, Patent Document 1 stops the pump when it detects that a person has entered the bathroom while the pump is operating, and enables the water level detection by the water level sensor. When the pump detects that the pump has entered the room, the pump stops the pump. Although it was stopped, there was a problem that when the predetermined time elapsed after the entry was detected, the reheating operation in which the pump was driven started, and the water level could not be detected by the water level sensor.

Since the present invention is to solve the above problems, the counts time after water filling operation completed, have rows firing operation chase by circulating hot water in the pump in the bathtub for each of the counting counts a predetermined time interval, A reheating control means for resetting the count after the completion of the reheating operation and then restarting the counting, and a human sensor for detecting the presence or absence of a person in the bathroom are provided, and based on the detection result of the human sensor. In a bath hot water supply device provided with a room entry determination means for determining whether or not a person has entered the room, a reheating possibility determination means for determining whether the reheating operation is permitted or prohibited is provided, and the reheating possibility is determined. When the entry determination means determines the entry of a person, the determination means determines that the reheating operation is prohibited, and when the reheating possibility determination means determines that the prohibition state, the count is calculated. Even if the predetermined interval time is reached, the reheating operation is not performed .

Further, a water level sensor for detecting a water level from the pressure change in the bathtub, on the basis of the detected pressure change in the water level sensor, comprising a bath determining means for determining whether a human has a bath, the reheating determination means , when the bathing determination means determines the bathing person, and, if the exit is determined by said entry judging means not determined bathing, to switch the disabled state to the enabled state, the counting When the predetermined interval time has been reached, the reheating operation is performed .

Further, when the room entry determination determines that the reheating possibility determination means is in the prohibited state of the reheating operation and the reheating possibility determination means determines that the prohibition state, the count is set to a predetermined interval time. By not performing the reheating operation even if it reaches the room, the reheating operation starts when the count reaches a predetermined interval time even if the reheating operation is not performed at the time of entering the room. It is possible to solve the problem that the bathing determination cannot be made because the bath circulation pump is driven.

Further, although the count in the disabled state of the reheating operation not the reach the predetermined interval time firing operation follow even so, when performing the bathing determination by bathing determining means, and, before filling without being judged bathing When the room determination means determines the exit, the reheating possibility determination means switches the prohibition state of the reheating operation to the permitted state and starts the reheating operation so that the bath temperature drops more than necessary. It is possible to prevent, keep the bath temperature warm, make a bathing judgment without impairing comfort, and if you leave the bathroom without taking a bath, the prohibition of reheating operation will be lifted, so next By keeping the bath temperature warm and effectively warming the bathroom, it is possible to prevent heat shock accidents associated with bathing.

Schematic diagram of the first embodiment of the present invention Flow chart showing switching operation of permission and prohibition of reheating operation of the present invention Flow chart showing the operation of the reheating operation of the present invention Time chart showing each state during reheating operation of the present invention

Next, the first embodiment of the present invention will be described with reference to the drawings.
1 is a hot water storage tank for storing hot water, 2 is a heat pump unit as a heating means for heating hot water, and 3 is a bathtub.

Reference numeral 4 denotes a heating circulation circuit that circulates the hot water storage tank 1 and the heat pump unit 2. The heat pump going pipe having the heating circulation pump 5 and connected to the lower part of the hot water storage tank 1 and the heat pump returning connected to the upper part of the hot water storage tank 1 The cold water in the lower part of the hot water storage tank 1 is heated by the heat pump unit 2 via the heat pump outbound pipe, and the heated high-temperature hot water is returned to the upper part of the hot water storage tank 1 by the heat pump return pipe to be warm water in the hot water storage tank 1. Is heated and stored. A hot water storage temperature sensor 6 is provided on the outer peripheral surface of the hot water storage tank 1, and the hot water storage amount is detected by detecting a predetermined temperature or higher.

7 is a water supply pipe that supplies water to the hot water storage tank 1, 8 is a hot water supply pipe that discharges hot water in the hot water storage tank 1, 9 is a water supply bypass pipe that branches from the water supply pipe 7 and bypasses the hot water storage tank 1, and 10 is a water supply bypass. A hot water supply mixing valve that mixes cold water from the pipe 9 and hot water from the hot water outlet pipe 8 so as to reach a set temperature, 11 is a hot water supply pipe that supplies hot water of the mixed set temperature, and 12 is provided at the end of the hot water supply pipe 11. It is a hot water tap. Reference numeral 13 denotes a hot water supply temperature sensor provided downstream of the hot water supply mixing valve 10, and reference numeral 14 denotes a hot water supply flow rate sensor for counting the amount of hot water supplied. Reference numeral 15 is a pressure reducing valve for reducing the water pressure to a predetermined pressure, and 16 is a pressure relief valve for releasing the overpressure caused by heating.

Reference numeral 17 denotes a bath circulation circuit, in which the bath heat exchanger 18 and the bathtub 3 for heat exchange between the hot water in the hot water storage tank 1 and the hot water of the circulating bath are connected to the bath going pipe 17a from the bathtub 3 to the bath heat exchanger 18. It is circulatedly connected to the bath return pipe 17b from the bath heat exchanger 18 to the bathtub 3.

19 is a bath circulation pump provided in the bath circulation circuit 17, 20 is a running water sensor for detecting the presence or absence of running water, 21 is a bath temperature sensor for detecting the temperature of the bath flowing through the bath circulation circuit 16, and 22 is a bathtub from the water pressure of hot water. It is a water level sensor that detects the water level in 3, and is provided on the upstream side of the bath circulation pump 19 in the middle of the bath circulation circuit 17.

23 is a hot water filling pipe that is branched from the middle of the hot water supply pipe 11 and connected to the bath circulation circuit 17 to fill the bathtub 3 with hot water, and 24 is provided in the hot water filling pipe 23 to start filling the bathtub 3. The hot water filling valve 25 for stopping is a bath flow rate sensor that counts the amount of hot water filled in the bathtub 3. Reference numeral 26 denotes a two-way valve provided between the hot water filling pipe 23 and the water level sensor 22, which is temporarily opened at the time of hot water filling to perform air purging of the pipe from the hot water filling pipe 23 to the bathtub 3 of the bath return pipe 17b. After that, the valve is closed so that the hot water can be filled while the water level sensor 22 monitors the accurate water level.

Reference numeral 27 denotes a heating control unit that controls the heating of the heat pump unit 2, and reference numeral 28 denotes a control device that controls hot water supply and bathing. The control device 28 is provided with a reheating operation control means 29 that controls the operation during the reheating operation, and a reheating possibility determination means 30 that mutually switches the permission and prohibition of the reheating operation under the conditions of the flowchart described later. There is.

Reference numeral 31 denotes a remote control in the bathroom provided in the bathroom, which can communicate with the control device 28, and is an operation unit 32 that sets the target temperature for reheating, which is the target temperature for reheating operation, and the bath setting amount, which is the target amount of hot water. A display unit 33 for displaying the setting contents and a motion sensor 34 for detecting the presence or absence of a person in the bathroom are provided.

The motion sensor 34 is a pyroelectric sensor that detects the amount of temperature change of the heat source in the detection area, and detects that there is a person in the bathroom. Specifically, the motion sensor 34 detects whether or not a person is present in the bathroom by detecting a temperature change in the detection area when the person moves or moves limbs or the like. Therefore, based on the detection result of the motion sensor 34, the entry determination means 35 provided in the control device 28 determines whether to enter the bathroom or leave the bathroom.

Further, the control device 28 is provided with a bathing determination means 36 for determining whether a person has bathed in the bathtub 3 or a person has taken a bath from the bathtub 3. Specifically, the bathing determination means 36 detects with the water level sensor 22 the pressure change that occurs when a person takes a bath in the bathtub 3 or goes out of the bathtub 3 when the bath circulation pump 19 is stopped. Then, based on the detection result, a person's bathing or bathing is determined.

The 37 is a remote controller outside the bathroom provided in the bathroom, which can communicate with the control device 28, and has an operation unit 32 and a display unit 33 like the remote controller 31 in the bathroom, but the motion sensor 34 is It is a remote control that is not equipped.

Next, the boiling operation will be described.
When there is a boiling request, the control device 28 drives a heating circulation pump 5 in the middle of the pipe connecting the hot water storage tank 1 and the heat pump unit 2, draws water from the inner and lower parts of the hot water storage tank 1, and heats it with the heat pump unit 2. By continuing the operation of returning to the upper part of the hot water storage tank 1, the water in the hot water storage tank 1 gradually boils to high temperature water.

Next, the hot water supply operation will be described.
When the hot water supply tap 12 is opened, water is supplied from the water supply pipe 7, flows into the lower part of the hot water storage tank 1, passes through the water supply bypass pipe 9, and the high temperature water extruded from the upper part of the hot water storage tank 1 and the water supply of the water supply bypass pipe 9 are the hot water supply mixing valve. Hot water that has been mixed at No. 10 and adjusted so that the set temperature for hot water supply and the temperature detected by the hot water supply thermista 13 are the same is supplied from the hot water tap 12.

In addition, the hot water filling operation will be described.
When the hot water filling switch of the in-bathroom remote control 31 and the out-of-bathroom remote control 37 is pressed, the control device 28 opens the hot water filling valve 24, supplies water from the water supply pipe 7, flows into the lower part of the hot water storage tank 1, and the water supply bypass pipe. The high-temperature water extruded from the upper part of the hot water storage tank 1 and the water supplied by the water supply bypass pipe 9 are mixed by the hot water supply mixing valve 10 and adjusted so that the bath set temperature and the temperature detected by the bath temperature sensor 21 are the same. The hot water filling is started by flowing the hot water into the bathtub 3. Then, the bath flow rate sensor 25 detects the flow rate, and when the total integrated value of the flow rates flows by the set amount of the hot water filling, the control device 28 closes the hot water filling valve 24 to complete the hot water filling. ..

Then, after the hot water filling operation is completed, the reheating control means 29 counts the time, and the bath circulation pump 19 is driven every time a predetermined interval time elapses to monitor the bath temperature detected by the bath temperature sensor 21. Then, when the bath temperature becomes lower than the reheating start temperature, the hot water in the bath 3 and the bath heat exchanger 18 in the hot water storage tank 1 are circulated through the bath circulation circuit 17, and the bath temperature is preliminarily set by the remote control in the bathroom. The temperature is raised to the reheating target temperature set by 31 and the remote control 37 outside the bathroom. This operation is performed every time a predetermined interval time elapses for a predetermined period (about 3 hours in this case) preset by the remote controller 31 in the bathroom and the remote controller 37 outside the bathroom after the completion of hot water filling (here, about 30 minutes). Every), this repetitive operation is referred to as heat retention operation.

Then, when the heat retention operation is started after the hot water filling operation is completed, the operation of the present embodiment by the operations of the reheating control means 29, the reheating possibility determination means 30, the room entry determination means 35, and the bathing determination means 36 Is started, and when the power of the in-bathroom remote control 31 or the out-of-bathroom remote control 37 provided outside the bathroom is turned off or the heat retention operation for a predetermined period is completed, the reheating control means 29 and whether or not the reheating is possible The operation of the present embodiment is stopped by the operations of the determination means 30, the entry determination means 35, and the bathing determination means 36. Further, the heat retaining operation by the reheating operation may be arbitrarily started or canceled by operating the remote controller 31 in the bathroom and the remote controller 37 outside the bathroom.

Next, switching between permission and prohibition of reheating operation performed at predetermined interval times will be described in detail based on the flowchart of FIG.
First, after the hot water filling operation is completed, the reheating possibility determination means 30 determines that the reheating operation is in the permitted state (S1). Then, when the motion sensor 34 detects the movement of a person in the bathroom and the room entry determination means 35 determines that the room is in the room based on the detection result of the motion sensor 34 (S2 is Yes), the reheating control means 29 The room entry flag: F1 = 1 is stored (S3), and the reheating possibility determination means 30 changes the reheating operation to the prohibited state based on the stored information (S4).

If the bathing determination means 36 does not determine that the bath is bathed and the entry determination means 35 determines that a person has left the bathroom (S5 is Yes), the reheating control means 29 stores the entry flag: F1 = 0. (S6), the reheating possibility determination means 30 changes the reheating operation to the permitted state based on the stored information (S7).

Further, if the entry determination means 35 does not determine that the room is leaving (S5 is No) and the bathing determination means 36 determines that the bath is bathing (S8 is Yes), the reheating control means 29 has an entry flag: F1 = 1 and a bathing flag. : F2 = 1 is stored (S9), and the reheating possibility determination means 30 changes the reheating operation to the permitted state based on the stored information (S10).

After that, when the entry determination means 35 determines that a person has left the bathroom (S11 is Yes), the reheating control means 29 stores the entry flag: F1 = 0 and the bathing flag: F2 = 0 (S12), and goes to S1. go back. Then, the same operation is repeated. This repetitive operation continues for a predetermined period (here, 3 hours) after the completion of the hot water filling or until the power of the in-bathroom remote controller 31 and the out-of-bathroom remote controller 37 is turned off.

In this way, the room entry flag: F1 = 1 and the bathing flag: F2 = 0, in other words, in the state of being in the room and not yet bathed in the room, the reheating operation is prohibited, so that the bath It is possible to avoid the situation where the bathing determination cannot be made because the circulation pump 19 is driven.

Also, if you leave the bathroom without taking a bath after entering the room, the reheating prohibition state will be canceled and the reheating permitted state will be changed, so the bath temperature will be warm for the next person. By keeping the bathroom warm and keeping it warm, you can prevent heat shock accidents caused by bathing.

Next, the operation of the reheating operation will be described in detail based on the flowchart of FIG.
After the hot water filling operation is completed, the reheating control means 29 starts time counting (S13), and when a predetermined interval time elapses (S14 is Yes), the reheating control means 29 is based on the flowchart of FIG. It is confirmed whether the reheating operation is in the permitted state or the prohibited state (S15), and when the reheating operation is in the permitted state (S15 is Yes), the reheating operation is started (S16).

After that, when the bath temperature detected by the bath temperature sensor 21 reaches the reheating target temperature (S17 is Yes), the reheating control means 29 stops the drive of the bath circulation pump and ends the reheating operation (S18). ), Reset the time count (S19), and return to S13. Then, the same operation is repeated. This repetitive operation continues for a predetermined period (here, 3 hours) after the completion of the hot water filling or until the power of the in-bathroom remote controller 31 and the out-of-bathroom remote controller 37 is turned off.

In this way, the room entry flag: F1 = 1 and the bathing flag: F2 = 0, in other words, in the state of being in the room and not yet bathed in the room, the reheating operation is prohibited, so that the bath It is possible to avoid the situation where the bathing determination cannot be made because the circulation pump 19 is driven, and the reheating operation is not started even if the time count reaches a predetermined interval time during the reheating prohibited state. When the bathing determination means 36 can determine the bathing, the reheating possibility determination means 30 can change the reheating operation prohibited state to the reheating permitted state and start the reheating operation, so that the bath temperature is higher than necessary. It is possible to prevent the bathing temperature from dropping, keep the bath temperature warm, and make a bathing judgment without impairing comfort.

Next, the state of the person, the reheating operation, the time count, and the bath temperature will be described in detail based on the time chart of FIG.
FIG. 4 is a time chart when it is determined that a person has entered the room during the time count. The time is counted after the completion of the hot water filling operation or the reheating operation of the heat retaining operation, and when the time count reaches a predetermined interval time, the reheating operation of the heat retaining operation is started.

However, when the entry determination means 35 determines that a person has entered the bathroom, the reheating possibility determination means 30 is changed to the reheating operation prohibited state, and until the bathing determination means 36 determines that a person has bathed in the bathtub. , Continue the reheating operation prohibited state. When the reheating operation is prohibited, even if the time count reaches a predetermined interval time, the reheating operation is not started and the reheating operation is waited for.

Then, when the bathing determination means 36 determines that a person has bathed in the bathtub, the reheating possibility determination means 30 changes the reheating operation prohibited state to the reheating operation permitted state, and the reheating control means 29 changes the reheating operation prohibited state to the reheating operation permitted state. Is started, the bath temperature is raised to the reheating target temperature, and when the reheating target temperature is reached, the driving of the bath circulation pump 19 is stopped to complete the reheating operation. Then, the time count is reset and the time count is started.

In this way, by prohibiting the reheating operation after the entry judgment, the bath temperature may be lower than the normal bath temperature after counting the predetermined interval time, but when the bathing judgment is made, the reheating target temperature may be lowered. By performing the reheating operation in which the temperature rises to the maximum, the temperature becomes higher than that at the start of bathing, so that the warmth feeling of the bather can be improved and the comfort can be improved.

Here, if you soak in a hot bath at the time of the first bath, there is a concern that the blood pressure will rise sharply and cause a heat shock, but in this embodiment, reheating operation is prohibited from entering the room to bathing. By reducing the difference between the temperature in the bathroom and the bath temperature, it is possible to suppress fluctuations in blood pressure at the time of the first bathing due to bathing, and it is possible to prevent heat shock. In addition, the risk of heat shock is reduced because the body has already become accustomed to the hot water at the second and subsequent baths, and the target reheating temperature is returned to the original high temperature to improve comfort. ing.

Further, if the entry is not determined, the reheating is not prohibited, so that the bathroom can be effectively warmed and a heat shock accident due to bathing can be prevented.

The present invention is not limited to the present embodiment and does not prevent modification without changing the gist. For example, this time, the heat pump type hot water storage water heater was used, but the hot water storage tank 1 A water heater equipped with a heater inside or a water heater that heats hot water with a heat source such as a burner may be used.

1 Hot water storage tank 3 Bathtub 17 Bath circulation circuit 18 Bath heat exchanger 21 Bath temperature sensor 28 Control device 29 Reheating control means 30 Reheating possibility judgment means 31 Remote control in bathroom 34 Human sensor 35 Bathing judgment means 36 Bath judgment means

Claims (2)

Reset with counting time after water filling operation completed, the count had rows firing operation chase by circulating hot water in the pump in the bathtub for each counting a predetermined time interval, the count after the reheating operation completion After that, it is provided with a reheating control means for restarting the counting and a human sensation sensor for detecting the presence or absence of a person in the bathroom, and determines whether or not a person has entered the room based on the detection result of the human sensation sensor. In the bath hot water supply device provided with the room entry determination means, the reheating possibility determination means for determining whether the reheating operation is permitted or prohibited is provided, and the reheating possibility determination means is provided by the room entry determination means. When it is determined that a person enters the room, it is determined that the reheating operation is in the prohibited state, and when the reheating possibility determining means determines that the reheating possibility determination means is in the prohibited state, even if the count reaches a predetermined interval time, the chasing is performed. A bath hot water supply device that is characterized by not performing burning operation . A water level sensor that detects the water level from a pressure change in the bathtub and a bathing determination means that determines whether or not a person has taken a bath based on the pressure change detected by the water level sensor are provided . If the bathing determination means determines the bathing person, and, if the exit is determined by said entry judging means not determined bathing, to switch the disabled state to the enabled state, the count is a predetermined The bath hot water supply device according to claim 1, wherein the reheating operation is performed when the interval time of the above is reached . ..

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